Anchor.



J. KENNEDY.

11101103. APPLICATION IiIaED JUNE 24, 1910.

Patented-May 9, 1911.

UNITED STATES PATENT OFFICE.

JOSEPH KENNEDY, OF NEW YORK, N. Y., ASSIGNOR TO THE ELEMENTS. OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

ANCHOR.

Specification of Iietters Patent.

Patented May 9, 1911.

Application filed June 24, 1910. Serial No. 568,642.

4 citizen of the United States of America, and

vice from being withdrawn under any sure that may be applied to the bolt, while a resident of New York, county and State of New York, have invented certain new and useful Improvements in Anchors, of which the following is-a specification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to anchors, and particularly to an improved form of bolt anchor adapted to be embedded in concrete and to receive the threaded ends of holding or retaining bolts.

The bolt anchor comprises a'base, a cylindrical hub uprising therefrom, and webs connecting the hub with the base, the hub being formed with a bore comprising a plurality of threaded portions of progressively reduced diameter whereby the device is adapted for use with different sized bolts, the said hub being further provided with means near its upper end to which an extension shell may be secured. The extending base forms a powerful anchorage and prevents the dethe wings or ribs serve to prevent the device from being turned in the concrete. The whole constitutes an exceedingly inexpensive and efiicient device for the purpose specified. 4

In order that my invention may be fully understood, I will now proceed to describe an embodiment thereof, havin reference to the accompanying drawings il ustrating the same, and will then tures in claims.

In the drawings: Figure 1 is a view in central vertical section through an anchor constructed in accordance with my invention. Fig. 2 is a top view thereof. Fig. 3 is a view in central vertical section through the anchor, showing the same employed in use and having an extension shell attached. thereto. Fig. 4 1s a v1ew .1n sideielevation of a slightly modified form of the anchor showing the same in use. Fig. 5 is a similar view showing a portion of an extension shell attached thereto.

The anchor comprises a base 10 conveniently of cylindrical form, a hub 11 uprising from the central portion thereof, and wings or webs 12 which connect the said hub with pres-.

point out the novel feathe portion of the base 10 which extends outward therefrom.

Thehub is'provided with an interior bore having a plurality of screw threaded por .tions l3-.14.-15 of progressively reduced diameter. The reduction is such that the major diameter of a smaller threaded portion is jnstless than the minor diameter of the preceding threaded portion, whereby a bolt having a threaded portion fitting the threads 14 will clear the threads 13 when being inserted, andsimilarly, a bolt having a threaded portion fitted to the threads 15 will clear the threads 14 when being inserted. This will be understood by an inspection ,of Fig. 3 in which a bolt 16' is shown with a lower threadedportion-fitted to the threads 14, the shank of the bolt just clearing the threaded portion 13. The several screwthreaded portions 13, 14, and 15 are longitudinally spaced. apart as shown, the space to the rear of each said screw-threaded portion being of a diameter not less than the greatest diameter of the said screw-threaded portion at the base of the threads thereof. The hub 11 is provided near'its upper end with means whereby it may have an extension shell secured thereto. I

In the form shown inv'Figs. 1, 2 and 3 the upper portion of the hub-11 is exteriorly threaded as is shown at 17, to receive a socket 18 by which an extension shell 19 cured thereto.

may be se In the'form shown in Figs. 1 and 5 the upper end of the hub 11 is-shown-as provided with an annular recessed. portion 20 and a .thin. tubular. metal or tapered shell 21 is adapted to be secured thereto bymeans of, a wire tie 22 or similar fastening device, as will be well understood by reference to Fig. 5.

In use the anchor iszcmbcdded in the concrete while the same is being cast in position, an extension shell of the required length being added tbercto if the anchor is to be disposed at some distance from the surface as is shown at Fig. 3. Thereafter a holding down bolt 16 of the required size is inserted into position andbolted firmly into place.

A concrete anchor of this character is especially adapted for holding foundation bolts in os ition. Such an anchor will stand substantially any strain that can be applied thereto without being dislodged or rotated,

' compact form and is adapted for use with bolts ofvarious diameters. Beingl made in I one piece there is no assembling required and the danger of crossing threads when the bolt is inserted, is entirely obviated. I have shown three sets of screw threads as being a convenient number, but it will, of

course, be understood that I may employ a greater or less number as maybe desired.

What I claim-is: 1. As an article of manufacture a bolt anchor comprising a single integral metallic structure composed of a base, a substantially cylindrical hub uprising from the central portion thereof, and webs connecting the said hub with the said base, the said hub having aninterior bore comprising a pluralityof screw threadedportmnsfof progressively reduced diameter;

2. As an article of manufacture a bolt anchor comprising a single integral metallic structure composed ofa base, a substantially cylindrical hub uprising from the central portlon thereof, and webs connecting the said hub with the said base, the said hub having an interior bore comprising a plurality of screw threaded portions of progressively reduced diameter and being provided at its upper end with means whereby an extension shell may be secured thereto.

3. As. an article of manufacture a bolt anchor comprising a single integral metallic structure composed of a base, as'ubstantially cylindrical hub uprising therefrom, and

webs connecting the said hub with the'said base, the said hub having an interior bore comprising a plurality of screw threaded .portlons of progressively reduced diameter,

and being provided at its upper end with exterior threads by which an extension shell may be secured thereto.

4. As an article of manufacture, an anchor of the class described comprising a single integral metallic structure having an interior bore comprising a plurality of screw-thread- 

